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soc: ti: omap-prm: Fix occasional abort on reset deassert for dra7 iva 

On reset deassert, we must wait a bit after the rstst bit change before
we allow clockdomain autoidle again. Otherwise we get the following oops
sometimes on dra7 with iva:

Unhandled fault: imprecise external abort (0x1406) at 0x00000000
44000000.ocp:L3 Standard Error: MASTER MPU TARGET IVA_CONFIG (Read Link):
At Address: 0x0005A410 : Data Access in User mode during Functional access
Internal error: : 1406 [#1] SMP ARM
...
(sysc_write_sysconfig) from [<c0782cb0>] (sysc_enable_module+0xcc/0x260)
(sysc_enable_module) from [<c0782f0c>] (sysc_runtime_resume+0xc8/0x174)
(sysc_runtime_resume) from [<c0a3e1ac>] (genpd_runtime_resume+0x94/0x224)
(genpd_runtime_resume) from [<c0a33f0c>] (__rpm_callback+0xd8/0x180)

It is unclear what all devices this might affect, but presumably other
devices with the rstst bit too can be affected. So let's just enable the
delay for all the devices with rstst bit for now. Later on we may want to
limit the list to the know affected devices if needed.

Fixes: d30cd83f68 ("soc: ti: omap-prm: add support for denying idle for reset clockdomain")
Reported-by: Yongqin Liu <yongqin.liu@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2021-02-18 13:46:33 +02:00
parent a7b5d7c496
commit effe89e400
1 changed files with 5 additions and 1 deletions
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6
drivers/soc/ti/omap_prm.c
View File

@ -830,8 +830,12 @@ static int omap_reset_deassert(struct reset_controller_dev *rcdev,
reset->prm->data->name, id);
exit:
if (reset->clkdm)
if (reset->clkdm) {
/* At least dra7 iva needs a delay before clkdm idle */
if (has_rstst)
udelay(1);
pdata->clkdm_allow_idle(reset->clkdm);
}
return ret;
}